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Voting Power Techniques: What Do They Measure?

In: Voting Power and Procedures

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  • Sreejith Das

    (University of London)

Abstract

Voting power science is a field of co-operative game theory concerned with calculating the influence a voter can exert on the outcome of a voting game. The techniques used to calculate voting power have names like the Shapley-Shubik index, and the Banzhaf measure. They are invaluable when used to design democratically fair voting games. In this paper we examine these different techniques, with the specific aim of trying to understand what they are measuring. Many commentators have argued that the techniques are similar, albeit with different probability models. But by focusing upon the less well know differences that exist in the underlying measures themselves, it soon becomes apparent that the dissimilarities between the techniques extend far beyond their methods of counting voting coalitions.

Suggested Citation

  • Sreejith Das, 2014. "Voting Power Techniques: What Do They Measure?," Studies in Choice and Welfare, in: Rudolf Fara & Dennis Leech & Maurice Salles (ed.), Voting Power and Procedures, edition 127, pages 65-95, Springer.
    • Handle: RePEc:spr:stcchp:978-3-319-05158-1_5
    DOI: 10.1007/978-3-319-05158-1_5
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    Cited by:

    1. Fabi'an Riquelme & Pablo Gonz'alez-Cantergiani & Gabriel Godoy, 2018. "Voting power of political parties in the Senate of Chile during the whole binomial system period: 1990-2017," Papers 1808.07854, arXiv.org, revised Sep 2019.

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